Simulating brittle and ductile response of alumina ceramics under dynamic loading

E. C. Simons*, J. Weerheijm, L. J. Sluys

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)
8 Downloads (Pure)

Abstract

Alumina ceramic is often used in armour systems. This material is known to have a brittle response under tensile loading, while a ductile response is found when sufficiently high pressures are reached. During projectile impact a ceramic material experiences both tensile loading and high pressures, hence fails in both a brittle and ductile way. Properly capturing the ceramic failure in a single material model remains challenging. A viscosity regularized Johnson-Holmquist-2 model has been used to simulate dynamic loading on alumina ceramic. The simulations show that the brittle and ductile nature of the material can not be captured simultaneously in the current material model. A new failure strain formulation is proposed where the behaviour under tensile and compressive loading can be controlled independently. This allows to properly capture both the brittle and ductile response of the material in a single constitutive framework, with a single set of model parameters.
Original languageEnglish
Article number106481
Pages (from-to)1-20
Number of pages20
JournalEngineering Fracture Mechanics
Volume216
DOIs
Publication statusPublished - 2019

Bibliographical note

Accepted Author Manuscript

Keywords

  • Brittle
  • Ceramic
  • Ductile
  • Failure
  • Johnson-Holmquist

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